Milling-machine.



F. w. WHITE.

mums MACHINE.

v I APPLICATION FILED S EPT. 8,19-

1,192,807. I Patented July 25, 1916.

3 SHEETS-SHEET I.

W N Um I F. W. WHITE.

MILLING MACHINE.

APPLICATION FILED SEPT- 8, 19: 1.

Pateilted July 25, 1916.

3 SHEETS-SHEET 2.

F. W, WHITE.

MILLING MACHINE.

APPLICATION FILED SEPT- 8. 1911.

Patented Jul '25, 1916..

3 SHEETS-SHEET 3- ITED STATES PATENT OFFICE.

FRANK W. WHITE, OF MEADVILLE, PENNSYLVANIA, ASSIGNOR TO THE WM. H. PAGE BOILER COMPANY, A CORPORATION OF CONNECTICUT.

To all whom it may concern Be it known that I, FRANK W. WHITE, a

citizen of the United States, residing at Meadville, county of Crawford, and State of Pennsylvania, have invented certain new and useful Improvements in Milling-Machines, fully described and represented in the following specification and the accompanying drawings, forming a part of the same.

My invention relates to an improved mechanism adapted to perform milling, threading, and grinding operations. Its principal object is the construction of a machine by means of which tapered work may be produced both rapidly and with a high degree of precision. It includes particularly a machine in which double tapers may be cut, or threaded, or ground simultaneously. I Y e I have here shown my machine as applied to the threading of double-tapered cast iron nipples; the character of this work being such as to require the cooperation of all of the elements of the machine. But, as will be obvious, the mechanism may be used successfully for other milling operations as well as the particular one chosen for illustration; and,- by the substitution of abrasive wheels for the mills, it is also adapted for use as a grinding machine.

Referring to the drawings; Figure 1 is a front elevation of the machine, Fig. 2 is a plan, Fig. 3 an end elevation, Fig. 4 a detail of the stop-motion mechanism, Fig. 5 a detail in elevation of the belt drive, and Fig. 6 a plan of the swiveled work-carrier.

The principal elements of the mechanism consists of a stationary cutter head,,,a sliding bed or carriage upon which the workholder is swiveled, and devices for imparting movement to these elements.

The cutter head.-As shown in Figs. 1 and 2, upon the frame 10 of the machine at its right hand end is clamped the block-11, to which is gibbed the two slides 12 and 12, which are transversely movable. These slides respectively carry the spindle bearing blocks 13 and 13*, which are independently adjustable upon the slides 12 and 12 by means of the screws 14. The spindles 15 and 15 are parallel with'each other are equipped with mills or other-tools, an are.

Serial No. 648,255.

driven by means of gears 16, 17, pulley 18 and gears 16, 17 pulley 18" respectively.

Each of the slides 12, 12 has a pin and slot connection 12 12 with a cam plate 19, as shown in Fig. 2. The cam plate is longitudinally movable, and in its movement it Patented July 25, 1916.

will. The cam plate is also moved automatically by means of a bolt or thrust rod '24, longitudinally disposed within the cutter head and adapted to contact with an adgusting screw 25 mounted in the lever 20, as shown in Fig. 1. The inner end of the bolt 24 projects into the path of the travelng bed or carriage to be subsequently descr bed,- and when the bed approaches its limit of motion, the rod 24 is driven back,

moving the lever 20 outward and thereby communicating a corresponding movement to the cam plate. The diagonal slots 12 and 12 in the cam plate are so disposed that this movement throws the slides 12 and 12*, with their respective spindles, away from the center line of the machine. 7 7

By the mechanism thus described, the cutters carried by the spindles are independently adjustable in a transverse direction by means of screws 14; they may be simultaneously thrown into orout of operative.

position manually by means of the lever 22; and they may be automatically thrown out in the same way by bolt 24.

The sliding carriage-As shown in Figs. 1, 2 and 3, the frame 10 of the machine is provided with longitudinal ways in which the carriage 30 is movable. To the carriage at 31 is swiveled the chucking head or member 32, which may be secured in any desired angular position on the carriage by clamping the pivot, 31 and the bolts, 33 and 34 attached to the carriage and passing through arc slots 33 and 34 ries a spindle 35 upon the inner end of which a suitable chucking device 36 is The member 32 carwormwheel 37- mounted thereon which is driven by :1 worm 37 and wormshaft 38 transversely journaled in the swivel member 32. A bracket 39 is attached to the member 32' and carries the bearings for the pulley 40, and gears 41, 42, as shown in Fig. 3, by

means of which the wormshaft 38 is ro- "tated. The gears 41, 42 are change gears by secure proper cutting speeds.

' any desired extent.

angularity between the carr age and mem-- which the speed of rotation of the spindle may be varied according to the diameter of the work to be carried by the spindle or to They carriage is movable either by hand or automatlcally. The manual means, as shown in Fig; 3, comprises the hand wheel 43 mounted upon a short shaft 5 carried by the frame 10. A spur gear 44 attached' to the shaft meshes with a rack 45- attached to the carriage.

' The automatic carriage feed is best shown in Figs. 1 and 2. The spindle 35" carries a gear 46 which meshes with a. tumbler gear '47, in turn communicating motion to the gear 48. 'The gear 48 is attached'to a lead screw 49 supported by athrust bearing 50 mounted on the carriage 30. A bracket 51 is'fastened to the frame of the machine and is equipped with a split nut 52 adapted to engage the lead screw. The nut 52 is opened and closed by means of a lever 53 provided with slots 54 which engage pins 55 carried by the halves of the nut. When the nut is closed upon the lead screw, the rotation of the latter by the. train of mechanism described, will cause a for ward movement ofthe carriage, feeding the work to the cutters at-the desired rate.

On account of the angularity between the carriage 30 and the swiveled member 32-, the' gears 46, 47, 48 are somewhat skewed. It is obvious, of course, that by changing these gears as in a lathe, the ratio of the sliding movement of the carriage to the rotary movement of the spindle may be altered to- If a wider range of her 32 be desired, any suitable universal driving mechanism for member 32 may be substituted for that shown.

A stop-feed mechanism is provided for the carriage, as shown in Figs. 2, 3 and 4. The wormsh'aft 38 is pivoted to the swivel member 32 by a swivel bearing shown at .60, and the forward end of the shaft terminates in a handle 61 which projects through a slot 62 located in a spring latch 63 pivoted at 64 and movable outward against the tension of a spring 66. The

wormshaft 38 is supported by an innershoulder 67 upon the latch 63. An adjustable cam stop is attached to the frame ofthe machine, and as the carriage travels to, the right, as viewed in the figures, the upper part of the latch 63 come into contact with the stop 65 and is cammed forward,

meaeo'z thereby releasing the wormsha ft and allowing it to fall. The consequent disengagement of the worm from the Wormwheel stops both the rotary and sliding movements of the work-carrier.

The belt drive for the cutter spindles is shown in Fig. 5, in which 70 represents the driving pulley on the countershaft and 71 and72 a pair of idlers.

The pulley 40 being attached to the swivel member 32. takes up a similar angular p0;

, I I sition, and it is also carried along by the" longitudinally movement of the bed, consequently this pulley .isybelted to a driving drum in a well known manner.

In Fig. 6, a double-tapered nipple 100 is shown in the position it occuples when chucked, and the member 32 carrying the chuckflisswiveled to the proper degree. It will be noticed that in this position, the cutter onspindle 15 engages the taper a of the periphery, and the cutter on spindle 15 engages the taper b. This arrangement permits the simultaneous operation of the two cutters, so that a thread may be cut on each tapered section at the same time, cutter 15 working from the outer part of the nipple toward the center and cutter 15 working from the center of the nipple outward. It should be noted that this simultaneous cutting of threads upon a double taper is accomplished by a simple, straight line feeding operation-that of moving the carriage in a line ,parallel with and in longitudinal alinement with the milling spindles, the nipple and the mills all rotating at the same time.

It is obvious that quite apart from the thread-cuttlng operation described above,

this machine may be used extensively for by the swiveled member, means to rotate the workholder, and to advance the carriage toward the cutter head simultaneously with the rotation of the workholder.

1 2. In combination, parallel spindles adapted to carry tools, mounts for and means to rotate the spindles, a rotary workholder adapted to be positioned in angular relation to the spindles, a mount for and -means to rotate the workholder, and means simultaneously operable with the rotation cal axis passing through the center line of the bed, means to move the swiveled mount longitudinally along the bed, and means si-- multaneously operable to rotate the workholding spindle.

4. A plurality of milling arbors mounted parallel with one another, means to rotate the arbors, a carriage movable in a plane parallel to and in longitudinal alinement with the arbors, a swiveled head fitted to said carriage, a spindle and chuck mounted in the head, and means to rotate the spindle and chuck. I

5. A plurality of milling arbors mounted parallel with one another, means to rotate the arbors, a carriage movable in a plane parallel to and in longitudinal alinement with the arbors, a swiveled head fitted to said carriage, a spindle and chuck mounted in the head, and means to rotate the spindle and the chuck simultaneously with the translatory movement of the carriage.

6. A plurality of milling arbors adapted to carry cutters, the axes of the arbors lying parallel with one another, a spindle carrying a chuck, means for adjusting the spindle so that its axis may lie at an an le relative to the axes of the arbors, means or impart-' mg compound movements to sald spindle and chuck, the said movements comprising a rotation of the spindle about its axis, and a translatory movement of the spindle in a plane parallel with the axes of the arbors and in the direction of said arbors.

7. A thread miller comprising a lurality of parallel milling arbors, a mpp e holder adapted to holdthe nipple at an angle relative to the mills, to advance the n1 plc to the mills while maintaining the ang e, and to rotate the nipple during the said advance movement.

8. In a machine for milling double-tapered nipples, the combination of a plural-- ity of milling arbors, and means adapted to hold the nipple at an angle to the mills and to feed the nipple to the mills wherebythreads may be simultaneously out upon both tapered surfaces of the nipple. I

9; A machinefor milling double tapered nipples including the combination of a plurality of milling arbors adapted to carry mills having their cutting edges substantially parallel, a chucking device for the nipple adaptedto hold the nipple at an angle relative to the mills, and means to cause a relative movement between the mills and the .chucking' device whereby threads may be simultaneously cut upon both tapered surfaces of the nipple. 1

10. Athread milling machine including mechanism comprising a plurality ofarbors adapted to carry mills having substantially parallel cutting edges relative to the work, and a work holder adapted to present the Work to the mills at an angle, whereby a plurality of threads at anglesto each other may be simultaneously cut, substantially as described.

11. In combination, the slides 12, 12

adapted to be moved toward and from each other, the slotted cam plate 19 adapted to impart a simultaneous and equal movement to the slides, the blocks 13, 13 carried by the respective slides and adjustable thereon, milling arbors 15, 15 mounted within the blocks, means to rotate the arbors, and a swiveled work supporting mount 32 and spindle 35 adapted to present the work to the cutter arbors at an angle. 7

12. In combination, the driving pulley 70, idlers 71, 72, driven pulleys 18 and 18, and cutter arbors 15, 1 5, the said cutter arbors being arallel with each other and adapted to be riven in opposite directions, a work spindle 35, a swiveled journal 32 for the spindle and adapted to present the spindle to the cutter arbors at an angle, a wormwheel 37 attached to the spindle and a worm and shaft 38 adapted to drive the wormwheel and spindle.

In testimony whereof, I have hereunto set my hand, in t ie presence of-two subscribing wltnesses.

FRANK 'w. WHITE.

Witnesses:

J OHN H. HODGKINSON, G. THEO. CAMPBELL. 

